Modeling and Design Considerations for ZVS Asymmetrical Half-Bridge Converter

Practical point of view in modeling and design considerations for a zero-voltage-switched (ZVS) asymmetrical half-bridge (ASY-HB) converter is proposed. Six dynamic conversion states for describing the converter characteristics are explored and modeled, including two power-delivery states, two resonant states, and two energy-transition states etc. Design considerations are examined thoroughly. A design of 300 W ZVS ASY-HB converter is examined and a high efficiency up to 92% at full load is achieved. All performances verified by experiment are quite well and close to the theoretical predictions.